> Seeing as the device can use a different gases as fuel, wouldn't we expect that the output would be dependent on the fuel supplied? It depends on where the l

> Seeing as the device can use a different gases as fuel, wouldn't we expect that the output would be dependent on the fuel supplied? It depends on where the limits are. Consider the typical gas furnace. I understand that natural gas varies considerably in energy per gram (or per cubic feet at a standard pressure). Within limits, the system adjusts the amount consumed to account for that and appropriate output. Meanwhile, an electric hair dryer doesn't - it's heat output is determined by the input voltage, current, and wave shape.